Isophomazarin, a minor pigment isolated from the mycelium of Pyrenochaeta terrestris has been assigned the structure 6-n-butyl-4,5,8-trihydroxy-7-methoxy-l-aza-anthraquinone-2-carboxylic acid from biogenetic considerations and a comparison of its chemical behaviour, and of spectral data of its derivatives with those of phomazarin.
R. Effenberger and T. J. Simpson, J. Chem. Soc., Perkin Trans. 1, 1979, 823 DOI: 10.1039/P19790000823
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